It may be possible to confirm family relationships by comparing test results with Don or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-BY11723, FTDNA kit #487839, MitoYDNA ID T12542[compare]
Mitochondrial DNA test-takers in the direct maternal line:
Mitochondrial DNA Test Full Sequence, haplogroup H73, MitoYDNA ID T12543[compare]